Their testes are located outside of the body, suspended by the spermatic cord within the scrotum.
From the en.wikipedia.org
The cremasteric muscle is part of the spermatic cord.
From the en.wikipedia.org
The vas deferens also passes upward along the side of the testicles to become part of the spermatic cord.
From the en.wikipedia.org
In September 2006, he removed the left testicle of a 25-year-old man after it twisted on the spermatic cord and choked off blood supply.
From the stltoday.com
Vasoconstriction begins in the penis, the heart rate increases, scrotum thickens, spermatic cord shortens, and the testicles become engorged in blood.
From the en.wikipedia.org
Bell Clapper Deformity is a deformity in which the testicle is not attached to the scrotal walls, and can rotate freely on the spermatic cord within the tunica vaginalis.